Mersen W1000266 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T402 12kVAC IEC 25A d56mm, L292mm With Thermal Striker 80N
Mersen

W1000266

Alternate Item Number: 45DB120V25PTD

Contact for Pricing

Overview

The Mersen W1000266 is a high-voltage DIN back-up fuse specifically engineered for transformer protection within switchgear and controlgear systems. This Limitor®-PTD HV fuse-link operates at 12kVAC and is rated for 25A, featuring a 56mm diameter and a 292mm length. It adheres to stringent IEC 60282-1 and VDE 0670 T402 standards, ensuring reliable performance in critical applications. A key feature is the integrated thermal striker, rated at 80N, which provides clear fault indication. The construction utilizes pure silver fuse elements, silver-coated copper caps, and a durable ceramic body, contributing to its longevity and effectiveness. Mersen's W1000266 is recommended by industry leaders like Siemens and Ormazabal for deployment in gas-insulated switchgear. This fuse-link offers essential thermal and dynamic protection against short-circuit currents, safeguarding transformers in industrial and utility environments. Its design ensures robust compatibility with high-voltage systems and various switchgear configurations, making it a trusted component for transformer safety.
  • High-voltage DIN back-up fuse for transformer protection
  • Rated for 12kVAC and 25A
  • Features a 56mm diameter and 292mm length
  • Equipped with an 80N thermal striker for fault indication
  • Compliant with IEC 60282-1 and VDE 0670 T402 standards

Specifications

AC Voltage Rating
12 kV
Amperage Rating
25 A
Application
HV Transformer protection
Body Material
Ceramic
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Silver-Plated Copper
Current Rating
25 A
Interrupt Rating
63 kA
Material
Ceramic, Silver, Copper
Material
Ceramic, Silver, Silver-coated Copper
Material
Pure silver fuse elements, silver-coated copper caps, ceramic body
Material
Pure silver, silver-coated copper, ceramic
Mounting
Clip
Mounting Type
DIN
Series
Limitor®-PTD HV
Series
Limitor®-PTD
Series
Limitor® VDE T402
Size
d56mm L292mm
Size
d56mm, L292mm
Size
14.09 x 2.2 in
Size
358 x 56 mm
Special Features
High breaking capacity High current limitation Low switching voltage Medium striker 80N/30mm CPD striker: controlled power dissipation Indoor and outdoor applications Quick breaking Non-ageing Energy efficiency New cap design for a better compatibility with all types of clips and easier assembly Coordination with IEC 60787, IEC 62271-105, IEC/TR 62655 and VDE 0670 T303
Standard
IEC 60282-1 VDE 0670 part 4 VDE 0670 part 402 DIN 43625
Sub Brand
Limitor®
Type
DIN HV Back-up Fuses for Transformers
Type Of Indicators
Striker
Voltage Rating
12 kVAC
Voltage Rating
12 kV
Package Dimensions (L x W x H)
14.09 in x 2.2 in x 2.2 in
Package Dimensions (L x W x H)
358 mm x 56 mm x 56 mm
Package Weight (Imperial)
3.748 lb
Package Weight (Metric)
1.700 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

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Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.